Add internal QQuickPageLayout helper

Does the header/content/footer layout for Page, and will
be shared with the upcoming Dialog.

Change-Id: Ic550a87b5f4bb4eb44e2d08a4c977183f3b5bbff
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 188 insertions, 0 deletions

diff --git a/src/quicktemplates2/qquickpagelayout.cpp b/src/quicktemplates2/qquickpagelayout.cpp
new file mode 100644
index 00000000..552cf3f7
--- /dev/null
+++ b/src/quicktemplates2/qquickpagelayout.cpp
@@ -0,0 +1,188 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickpagelayout_p_p.h"
+#include "qquickcontrol_p.h"
+#include "qquicktoolbar_p.h"
+#include "qquicktabbar_p.h"
+#include "qquickdialogbuttonbox_p.h"
+
+#include <QtQuick/private/qquickitem_p.h>
+
+QT_BEGIN_NAMESPACE
+
+static const QQuickItemPrivate::ChangeTypes ItemChanges = QQuickItemPrivate::Geometry | QQuickItemPrivate::Visibility | QQuickItemPrivate::Destroyed
+                                                        | QQuickItemPrivate::ImplicitWidth | QQuickItemPrivate::ImplicitHeight;
+
+namespace {
+    enum Position {
+        Header,
+        Footer
+    };
+
+    Q_STATIC_ASSERT(int(Header) == int(QQuickTabBar::Header));
+    Q_STATIC_ASSERT(int(Footer) == int(QQuickTabBar::Footer));
+
+    Q_STATIC_ASSERT(int(Header) == int(QQuickToolBar::Header));
+    Q_STATIC_ASSERT(int(Footer) == int(QQuickToolBar::Footer));
+
+    Q_STATIC_ASSERT(int(Header) == int(QQuickDialogButtonBox::Header));
+    Q_STATIC_ASSERT(int(Footer) == int(QQuickDialogButtonBox::Footer));
+}
+
+static void setPosition(QQuickItem *item, Position position)
+{
+    if (QQuickToolBar *toolBar = qobject_cast<QQuickToolBar *>(item))
+        toolBar->setPosition(static_cast<QQuickToolBar::Position>(position));
+    else if (QQuickTabBar *tabBar = qobject_cast<QQuickTabBar *>(item))
+        tabBar->setPosition(static_cast<QQuickTabBar::Position>(position));
+    else if (QQuickDialogButtonBox *buttonBox = qobject_cast<QQuickDialogButtonBox *>(item))
+        buttonBox->setPosition(static_cast<QQuickDialogButtonBox::Position>(position));
+}
+
+QQuickPageLayout::QQuickPageLayout(QQuickControl *control)
+    : m_header(nullptr), m_footer(nullptr), m_control(control)
+{
+}
+
+QQuickPageLayout::~QQuickPageLayout()
+{
+    if (m_header)
+        QQuickItemPrivate::get(m_header)->removeItemChangeListener(this, ItemChanges);
+    if (m_footer)
+        QQuickItemPrivate::get(m_footer)->removeItemChangeListener(this, ItemChanges);
+}
+
+QQuickItem *QQuickPageLayout::header() const
+{
+    return m_header;
+}
+
+bool QQuickPageLayout::setHeader(QQuickItem *header)
+{
+    if (m_header == header)
+        return false;
+
+    if (m_header) {
+        QQuickItemPrivate::get(m_header)->removeItemChangeListener(this, ItemChanges);
+        m_header->setParentItem(nullptr);
+    }
+    m_header = header;
+    if (header) {
+        header->setParentItem(m_control);
+        QQuickItemPrivate::get(header)->addItemChangeListener(this, ItemChanges);
+        if (qFuzzyIsNull(header->z()))
+            header->setZ(1);
+        setPosition(header, Header);
+    }
+    return true;
+}
+
+QQuickItem *QQuickPageLayout::footer() const
+{
+    return m_footer;
+}
+
+bool QQuickPageLayout::setFooter(QQuickItem *footer)
+{
+    if (m_footer == footer)
+        return false;
+
+    if (m_footer) {
+        QQuickItemPrivate::get(m_footer)->removeItemChangeListener(this, ItemChanges);
+        m_footer->setParentItem(nullptr);
+    }
+    m_footer = footer;
+    if (footer) {
+        footer->setParentItem(m_control);
+        QQuickItemPrivate::get(footer)->addItemChangeListener(this, ItemChanges);
+        if (qFuzzyIsNull(footer->z()))
+            footer->setZ(1);
+        setPosition(footer, Footer);
+    }
+    return true;
+}
+
+void QQuickPageLayout::update()
+{
+    QQuickItem *content = m_control->contentItem();
+
+    const qreal hh = m_header ? m_header->height() : 0;
+    const qreal fh = m_footer ? m_footer->height() : 0;
+
+    content->setY(hh + m_control->topPadding());
+    content->setX(m_control->leftPadding());
+    content->setWidth(m_control->availableWidth());
+    content->setHeight(m_control->availableHeight() - hh - fh);
+
+    if (m_header)
+        m_header->setWidth(m_control->width());
+
+    if (m_footer) {
+        m_footer->setY(m_control->height() - fh);
+        m_footer->setWidth(m_control->width());
+    }
+}
+
+void QQuickPageLayout::itemVisibilityChanged(QQuickItem *)
+{
+    update();
+}
+
+void QQuickPageLayout::itemImplicitWidthChanged(QQuickItem *)
+{
+    update();
+}
+
+void QQuickPageLayout::itemImplicitHeightChanged(QQuickItem *)
+{
+    update();
+}
+
+void QQuickPageLayout::itemGeometryChanged(QQuickItem *, const QRectF &, const QRectF &)
+{
+    update();
+}
+
+void QQuickPageLayout::itemDestroyed(QQuickItem *item)
+{
+    if (item == m_header)
+        m_header = nullptr;
+    else if (item == m_footer)
+        m_footer = nullptr;
+}
+
+QT_END_NAMESPACE